[style] apply google python style guide (#4501)

This commit applies and enforces Google's python style for tests.

tests/scripts/thread-cert/network_layer.py

@@ -59,6 +59,7 @@ class StatusValues(IntEnum):
 
 
 class TargetEid(object):
+
     def __init__(self, eid):
         self._eid = eid
 
@@ -75,6 +76,7 @@ class TargetEid(object):
 
 
 class TargetEidFactory(object):
+
     def parse(self, data, message_info):
         eid = bytearray(data.read(16))
 
@@ -82,6 +84,7 @@ class TargetEidFactory(object):
 
 
 class MacExtendedAddress(object):
+
     def __init__(self, mac_address):
         self._mac_address = mac_address
 
@@ -95,11 +98,11 @@ class MacExtendedAddress(object):
 
     def __repr__(self):
         return "MacExtendedAddress(mac_address={})".format(
-            hexlify(self.mac_address)
-        )
+            hexlify(self.mac_address))
 
 
 class MacExtendedAddressFactory(object):
+
     def parse(self, data, message_info):
         mac_address = bytearray(data.read(8))
 
@@ -107,6 +110,7 @@ class MacExtendedAddressFactory(object):
 
 
 class Rloc16(object):
+
     def __init__(self, rloc16):
         self._rloc16 = rloc16
 
@@ -123,6 +127,7 @@ class Rloc16(object):
 
 
 class Rloc16Factory(object):
+
     def parse(self, data, message_info):
         rloc16 = struct.unpack(">H", data.read(2))[0]
 
@@ -130,6 +135,7 @@ class Rloc16Factory(object):
 
 
 class MlEid(object):
+
     def __init__(self, ml_eid):
         self._ml_eid = ml_eid
 
@@ -146,6 +152,7 @@ class MlEid(object):
 
 
 class MlEidFactory(object):
+
     def parse(self, data, message_info):
         ml_eid = bytearray(data.read(8))
 
@@ -153,6 +160,7 @@ class MlEidFactory(object):
 
 
 class Status(object):
+
     def __init__(self, status):
         self._status = status
 
@@ -169,6 +177,7 @@ class Status(object):
 
 
 class StatusFactory(object):
+
     def parse(self, data, message_info):
         status = StatusValues(ord(data.read(1)))
 
@@ -176,6 +185,7 @@ class StatusFactory(object):
 
 
 class TimeSinceLastTransaction(object):
+
     def __init__(self, seconds):
         self._seconds = seconds
 
@@ -192,6 +202,7 @@ class TimeSinceLastTransaction(object):
 
 
 class TimeSinceLastTransactionFactory(object):
+
     def parse(self, data, message_info):
         seconds = struct.unpack(">L", data.read(4))[0]
 
@@ -199,6 +210,7 @@ class TimeSinceLastTransactionFactory(object):
 
 
 class RouterMask(object):
+
     def __init__(self, id_sequence, router_id_mask):
         self._id_sequence = id_sequence
         self._router_id_mask = router_id_mask
@@ -213,18 +225,16 @@ class RouterMask(object):
 
     def __eq__(self, other):
         common.expect_the_same_class(self, other)
-        return (
-            self.id_sequence == other.id_sequence
-            and self.router_id_mask == other.router_id_mask
-        )
+        return (self.id_sequence == other.id_sequence and
+                self.router_id_mask == other.router_id_mask)
 
     def __repr__(self):
         return "RouterMask(id_sequence={}, router_id_mask={})".format(
-            self.id_sequence, hex(self.router_id_mask)
-        )
+            self.id_sequence, hex(self.router_id_mask))
 
 
 class RouterMaskFactory(object):
+
     def parse(self, data, message_info):
         id_sequence = ord(data.read(1))
         router_id_mask = struct.unpack(">Q", data.read(8))[0]
@@ -233,6 +243,7 @@ class RouterMaskFactory(object):
 
 
 class NdOption(object):
+
     def __init__(self, options):
         self._options = options
 
@@ -245,12 +256,12 @@ class NdOption(object):
         return self.options == other.options
 
     def __repr__(self):
-        return "NdOption(options=[{}])".format(
-            ", ".join([str(opt) for opt in self.options])
-        )
+        return "NdOption(options=[{}])".format(", ".join(
+            [str(opt) for opt in self.options]))
 
 
 class NdOptionFactory(object):
+
     def parse(self, data, message_info):
         options = [opt for opt in bytearray(data.read())]
         return NdOption(options)
@@ -276,11 +287,13 @@ class XtalAccuracy:
 
 
 class XtalAccuracyFactory:
+
     def parse(self, data, message_info):
         return XtalAccuracy()
 
 
 class ThreadNetworkData(object):
+
     def __init__(self, tlvs):
         self._tlvs = tlvs
 
@@ -293,12 +306,12 @@ class ThreadNetworkData(object):
         return self.tlvs == other.tlvs
 
     def __repr__(self):
-        return "ThreadNetworkData(tlvs=[{}])".format(
-            ", ".join([str(tlv) for tlv in self.tlvs])
-        )
+        return "ThreadNetworkData(tlvs=[{}])".format(", ".join(
+            [str(tlv) for tlv in self.tlvs]))
 
 
 class ThreadNetworkDataFactory(object):
+
     def __init__(self, network_data_tlvs_factory):
         self._network_data_tlvs_factory = network_data_tlvs_factory